From tcampbell@cam.ac.uk Fri Feb 17 15:51:27 1995 Path: ashpoly!cascade!bigsur!cam!tcampbell From: tcampbell@cam.ac.uk (Tobias Campbell) Newsgroups: comp.sys.m68k Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Feb17.155127.9914@cam.ac.uk> Date: Fri, 17 Feb 1995 15:51:27 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882). Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow. A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. Anyone running this on a Quadra 840AV with the 68040? -- === Tobias Campbell === Dept of Electrical Engineering, University of Cambridge Computer Laboratory "When every node is whole, the channel opens." From tlopez@tum.de Sun Feb 19 14:39:27 1995 Path: ashpoly!cascade!mxgate!coyoacan!tum!tlopez From: tlopez@tum.de (Tyler López) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Feb19.143927.4810@tum.de> Date: Sun, 19 Feb 1995 14:39:27 GMT References: <1995Feb17.155127.9914@cam.ac.uk> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Feb17.155127.9914@cam.ac.uk>, tcampbell@cam.ac.uk (Tobias Campbell) writes: > Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882). Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Tyler López *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From rokonkwo@mit.edu Mon Feb 20 00:37:27 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mit!rokonkwo From: rokonkwo@mit.edu (Raj Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Feb20.003727.7293@mit.edu> Date: Mon, 20 Feb 1995 00:37:27 GMT References: <1995Feb17.155127.9914@cam.ac.uk> <1995Feb19.143927.4810@tum.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Feb19.143927.4810@tum.de>, tlopez@tum.de (Tyler López) writes: > Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. > Unsubscribe me from this list! (Wait, this is Usenet, never mind). Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. -- Raj Okonkwo Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------ From jchoi@panix.com Tue Feb 21 22:41:27 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!panix!jchoi From: jchoi@panix.com (Jen Choi) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Feb21.224127.8762@panix.com> Date: Tue, 21 Feb 1995 22:41:27 GMT References: <1995Feb17.155127.9914@cam.ac.uk> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Feb17.155127.9914@cam.ac.uk>, tcampbell@cam.ac.uk (Tobias Campbell) writes: > Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882). The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Jen Choi | jchoi@panix.com PGP Key fingerprint: 0706 CBAF CC18 C3A2 "Keep the channels open."